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3x + x = 4x
4x = 95 - 5 - 10
= 80
x =
= 20 derajat
sudut BAC = 3x - 5
3x = 20 x 3
= 60 - 5
= 55 derajat (A)
pertama tambahin 95 + 3x - 5 + x-10 = 180
karena sudut di segitiga 180
jadi 95-5-10+3x+x = 180
80+4x = 180
4x = 180-80
4x = 100
x = 100:4
x=25
BAC = 3x-5
masukan x nya
3(25)-5
75-5
70
D